Question: can you explain this ? 1 Which statement is not always true? (1) The product of two irrational numbers is irrational. (2) The product of

can you explain this ?

1 Which statement is not always true? (1) The product of two irrational numbers is irrational. (2) The product of two rational numbers is rational. (3) The sum of two rational numbers is rational. (4) The sum of a rational number and an irrational number is irrational

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